diff --git a/gfx/src/nsFont.h b/gfx/src/nsFont.h
index 7ce83cd6fea..cefec1a087b 100644
--- a/gfx/src/nsFont.h
+++ b/gfx/src/nsFont.h
@@ -64,7 +64,7 @@ const PRUint8 kGenericFont_monospace    = 0x08;
 const PRUint8 kGenericFont_cursive      = 0x10;
 const PRUint8 kGenericFont_fantasy      = 0x20;
 
-class gfxFontStyle;
+struct gfxFontStyle;
 
 // Font structure.
 struct NS_GFX nsFont {
diff --git a/layout/style/nsRuleNode.h b/layout/style/nsRuleNode.h
index 9a5cac13aed..e1db67ef1b0 100644
--- a/layout/style/nsRuleNode.h
+++ b/layout/style/nsRuleNode.h
@@ -60,7 +60,7 @@ class nsCSSValue;
 struct nsCSSRect;
 
 class nsStyleCoord;
-class nsCSSValuePairList;
+struct nsCSSValuePairList;
 
 template <nsStyleStructID MinIndex, nsStyleStructID Count>
 class FixedStyleStructArray